PHP -查找数组内的所有路径(双面)

function findPaths($array, $target, $path = []) {
    $paths = [];
    foreach ($array as $key => $value) {
        $currentPath = array_merge($path, [$key]);
        if ($value === $target) {
            $paths[] = $currentPath;
        } elseif (is_array($value)) {
            $subPaths = findPaths($value, $target, $currentPath);
            $paths = array_merge($paths, $subPaths);
        }
    }
    return $paths;
}

$array = [
    'a' => [
        'b' => [
            'c' => 'target',
            'd' => 'target',
        ],
        'e' => 'target',
    ],
    'f' => 'target',
];

$target = 'target';
$paths = findPaths($array, $target);

foreach ($paths as $path) {
    echo implode(' -> ', $path) . "\n";
}